Abstract: A toll collection system includes: a vehicle detector which detects entry of a vehicle to the lane; a vehicle type identification unit which identifies the vehicle type of the vehicle at a stage before the vehicle is detected by the vehicle detector; and a position measurement unit which measures, on the basis of a position measurement signal obtained by receiving, through a predetermined position measurement antenna, radio waves transmitted by the on-board unit after the vehicle is detected by the vehicle detector, the position of the on-board unit which has transmitted the radio waves. The position measurement unit is configured to measure the position of the on-board unit on the basis of an angle of arrival of the radio waves measured on the basis of the position measurement signal, and an installation height of the on-board unit estimated from a vehicle type identification result of the vehicle.

Abstract: A roadside device for communicating with vehicle-mounted equipment on a vehicle, via a roadside antenna, is provided with: a history reception unit for receiving from the vehicle-mounted equipment both roadside device identification information capable of specifying the roadside device that the vehicle-mounted equipment communicates with, and communication history information, recorded in association with radio wave intensities used in the communication with the roadside device; and a connection processing unit which continues the communication with the vehicle-mounted equipment when a first radio wave intensity associated with the roadside device identification information of the own roadside device is the greatest among the plurality of radio wave intensities included in the communication history information, and cuts off the communication with the vehicle-mounted equipment when the first radio wave intensity is less than a second radio wave intensity associated with the roadside device identification infor

Abstract: A communication control device includes: an identifier extraction unit which is configured to extract an identifier for identifying an on-board unit from an on-board unit transmission signal obtained by receiving, through a toll collection antenna, radio waves transmitted by the on-board unit; a position measurement unit which is configured to measure the position of an on-board unit which has transmitted radio waves on the basis of a position measurement signal obtained by receiving, through predetermined position measurement antennas, radio waves transmitted by the on-board unit; and an identifier registration unit which is configured to register the identifier included in the on-board unit transmission signal correlating with the position measurement signal as a permitted identifier when the position of the on-board unit, measured on the basis of the position measurement signal, is present within a prescribed defined communication region.

Abstract: A radio wave arrival angle detection device of the present invention extracts symbols and resolves the same into sub-carriers having various frequency components, for OFDM carrier waves received by a first antenna and a second antenna, respectively. The arrival angle of the carrier waves is calculated on the basis of the geometric relationship between a phase shift of the respective sub-carriers of the OFDM carrier waves received by the first antenna and the second antenna, and the arrangement of the first antenna and the second antenna.

Abstract: A communication region defining method is a method for defining a defined communication region in operation of a toll collection system having only an on-board unit present within the defined communication region as a communication target for toll collection and includes: a transmitter arrangement step of arranging reference transmitters capable of transmitting radio waves at a plurality of positions on a boundary line of a defined communication region; a position location step of locating a position of each of the plurality of reference transmitters on the basis of a position location signal obtained by receiving, through predetermined position location antennas, radio waves transmitted by the plurality of reference transmitters; and a determination condition setting step of setting conditions for determining whether to set an on-board unit as a communication target for toll collection on the basis of position location results with respect to the plurality of reference transmitters.

Abstract: A toll collection system includes: a vehicle detector which detects entry of a vehicle to the lane; a vehicle type identification unit which identifies the vehicle type of the vehicle at a stage before the vehicle is detected by the vehicle detector; and a position measurement unit which measures, on the basis of a position measurement signal obtained by receiving, through a predetermined position measurement antenna, radio waves transmitted by the on-board unit after the vehicle is detected by the vehicle detector, the position of the on-board unit which has transmitted the radio waves. The position measurement unit is configured to measure the position of the on-board unit on the basis of an angle of arrival of the radio waves measured on the basis of the position measurement signal, and an installation height of the on-board unit estimated from a vehicle type identification result of the vehicle.

Abstract: A communication control device includes: an identifier extraction unit which is configured to extract an identifier for identifying an on-board unit from an on-board unit transmission signal obtained by receiving, through a toll collection antenna, radio waves transmitted by the on-board unit; a position measurement unit which is configured to measure the position of an on-board unit which has transmitted radio waves on the basis of a position measurement signal obtained by receiving, through predetermined position measurement antennas, radio waves transmitted by the on-board unit; and an identifier registration unit which is configured to register the identifier included in the on-board unit transmission signal correlating with the position measurement signal as a permitted identifier when the position of the on-board unit, measured on the basis of the position measurement signal, is present within a prescribed defined communication region.

Abstract: A communication region defining method is a method for defining a defined communication region in operation of a toll collection system having only an on-board unit present within the defined communication region as a communication target for toll collection and includes: a transmitter arrangement step of arranging reference transmitters capable of transmitting radio waves at a plurality of positions on a boundary line of a defined communication region; a position location step of locating a position of each of the plurality of reference transmitters on the basis of a position location signal obtained by receiving, through predetermined position location antennas, radio waves transmitted by the plurality of reference transmitters; and a determination condition setting step of setting conditions for determining whether to set an on-board unit as a communication target for toll collection on the basis of position location results with respect to the plurality of reference transmitters.

Abstract: A radio wave arrival angle detection device of the present invention extracts symbols and resolves the same into sub-carriers having various frequency components, for OFDM carrier waves received by a first antenna and a second antenna, respectively. The arrival angle of the carrier waves is calculated on the basis of the geometric relationship between a phase shift of the respective sub-carriers of the OFDM carrier waves received by the first antenna and the second antenna, and the arrangement of the first antenna and the second antenna.